Games like Deductopia
Games like Deductopia include Murders on the Yangtze River, The Roottrees are Dead, Sherlock Holmes: Crimes and Punishments, The Case of the Golden Idol, and Duck Detective: The Secret Salami. We matched them by the tags players give Deductopia on Steam (Detective, Investigation, Puzzle, Family Friendly, and Adventure): closest matches first, and among equally close ones the better-known games.

Murders on the Yangtze River
Shared: Detective · Puzzle · Adventure

The Roottrees are Dead
Shared: Detective · Puzzle · Investigation

Sherlock Holmes: Crimes and Punishments
Shared: Detective · Investigation · Adventure

The Case of the Golden Idol
Shared: Detective · Investigation · Puzzle

Duck Detective: The Secret Salami
Shared: Detective · Investigation · Adventure

Strange Horticulture
Shared: Puzzle · Detective · Mystery

Sherlock Holmes: The Devil's Daughter
Shared: Detective · Adventure · Puzzle

The Rise of the Golden Idol
Shared: Investigation · Detective · Puzzle

Machinarium
Shared: Puzzle · Hand-drawn · Point & Click

L.A. Noire
Shared: Detective · Adventure · Investigation

Phoenix Wright: Ace Attorney Trilogy
Shared: Detective · Mystery · Puzzle

Lost in Play
Shared: Puzzle · Family Friendly · 2D

The Incident at Galley House
Shared: Detective · Puzzle · Mystery

Tangle Tower
Shared: Detective · Puzzle · Point & Click

The White Door
Shared: Puzzle · Detective · Adventure

The Rewinder
Shared: Adventure · Puzzle · Detective

Sanfu
Shared: Puzzle · Mystery · Adventure

Return to Monkey Island
Shared: Puzzle · Adventure · Point & Click

A Case of Fraud
Shared: Detective · Investigation · Puzzle

The Mermaid Mask
Shared: Detective · Puzzle · Adventure

ギルド探求団へようこそ!
Shared: Detective · Puzzle · Investigation

Scribblenauts Unlimited
Shared: Puzzle · Adventure · Family Friendly

Duck Detective: The Ghost of Glamping
Shared: Detective · Investigation · Adventure

The Painscreek Killings
Shared: Investigation · Detective · Puzzle